I believe Feynman is saying stay focused on your work, don't get too caught up changing things or keeping up because of other shiny things, you may miss importa

I believe Feynman is saying stay focused on your work, don't get too caught up changing things or keeping up because of other shiny things, you may miss important innovative ideas on your own work. It doesn't mean ignore others work but sometimes it is better to work it through yourself for understanding and then compare. Put all the energy into your work first and foremost. Same could go with starting a company or product - competition needs to be paid attention to, but if you do it too much it will lead you astray. The product may end up chasing or copycatting while missing out on some innovation that is entirely new and possibly important.